How Does Synchrotron Radiation Influence Observations in Radio Astronomy?

[shirin]

I read in radio astronomy book that radiation from high-energy electrons radiating synchrotron emision, is concentrated in the direction of its instantaneous motion. So if we see them, their orbital motion plane contains us(as observer). I am wondering if they have spiral motion in the related magnetic field, their orbital motion plane is moving instantaneously. So how are we observing their radiation continiously?

 

[phyzguy]

There are a huge (real huge!) number of electrons all spiraling around the magnetic field and all in different points of their orbits. So there are always some pointing at us.

 

[shirin]

Thanks!